Re: [Dev-C++] Network monitor - Question

[Daniel G. <sp...@ho...>]

Quick response!

I just logged back on to say I found a solution - and it sounds like you 
have found the reason.

I put a watch on m_hWnd and after calling the function it said the 
expression could not be evaluated. I had allocated the buffer wrongly!

unsigned long Buffer = 420;  // wrong
unsigned long Buffer[420]; // Horay!

So it seems the buffer was overwritten, and the variable m_hWnd was 
overwritten!

Does that seem right?


>From: Per Westermark <pw...@ia...>
>To: Daniel Glenfield <sp...@ho...>
>CC: zo...@ac...,  <Dev...@li...>
>Subject: Re: [Dev-C++] Network monitor - Question
>Date: Mon, 7 Apr 2003 17:38:05 +0200 (CEST)
>
>DWORD GetIpNetTable(
>   PMIB_IPNETTABLE pIpNetTable,  // buffer for mapping table
>   PULONG pdwSize,               // size of buffer
>   BOOL bOrder                   // sort by IP address
>);
>
>Are you setting your dwSize to the size of the buffer before calling
>GetIpNetTable()? Else the call might overwrite the buffer, and thereby
>destroy other variables in your program.
>
>/Per W
>
>On Mon, 7 Apr 2003, Daniel Glenfield wrote:
>
> >
> >
> > Hi, this was perfect for me and I didn't even ask the question! However
> > there is something I'm having trouble with relating to this set of
> > functions.
> >
> > I'm using VC++ (boo! lol) and using MFC I've built a dialog-based app 
>that
> > gets info with GetIfTable() and some others. One of these functions is
> > GetIpNetTable() which gets the ARP table.
> >
> > The problem is this - after much debugging I find that when I call
> > GetIpNetTable() the window handle becomes 0 !!!! So while everywhere 
>else I
> > can call SetDlgItemText() to put the buffer contents into an edit box, I 
>now
> > get Assert errors (even if I try to exit the function!) because hwnd is 
>0!
> >
> > Has anyone heard of this? I've not found it on google.
> >
> > Daniel
> >
> >
> >
> >
> > >From: Zodiaq <zo...@ac...>
> > >Reply-To: Zodiaq <zo...@ac...>
> > >To: Dev...@li...
> > >Subject: Re: [Dev-C++] Network monitor
> > >Date: Sun, 6 Apr 2003 18:13:13 +0200
> > >
> > >Hello Lambdabit and all Dev-C++ users,
> > >
> > >Sunday, April 6, 2003, 4:33:46 PM, Lambdabit wrote as follows:
> > >
> > >LJGS> how can I get the speed of my net interface's connection and the
> > >packages sent and received?
> > >
> > >By calling Win32 API function named GetIfTable you get CURRENT bytes
> > >sent and received for every interface (including loopback)... if you
> > >call this function every 1sec (using timer) you can easly obtain speed
> > >in bytes... but remember that this gives you total network load -
> > >every byte of packets counts...
> > >for more info and examples check msdn.microsoft.com
> > >
> > >LJGS> Thanks!
> > >
> > >--
> > >regards, Zodiaq
> > >
> > >
> > >
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